Those are the exact same capacities as last year's Galaxy S8 and Galaxy S8 + flagships. (pocket-lint.com)
As per my guess, Samsung will continue with same Adaptive Fast Charging since S8 and S8 Plus have same capacity batteries as Galaxy S8 and Galaxy Note 7, so they should charge up pretty fast. (sammobile.com)
The sedan derives its power from the 1.6 L, 4 - cylinder petrol and same capacity diesel powertrains. (rediff.com)